2427514 - I16 CENTRE BRAKE LIGHT ("THIRD BRAKE LIGHT") NOT WORKING

When the brake pedal is pressed, with the ignition on, the centre brake light ('third brake light') does not work. If the side stop lights are not working either, see Table I015
Results of the tests
1CHECK ON INDIVIDUAL LIGHTSAll OKProblems metOperation
Check the condition of the third brake light Continue to Step 2Third brake light not workingChange third brake light
2BRAKE LIGHTS SWITCH CHECKAll OKProblems metOperation
Check that the brake light switch is correctly fastened and working properlyContinue to Step 3Brake light switch faultyRenew or replace the brake light switch
3BRAKE LIGHTS ELECTRICAL CIRCUIT CHECKAll OKProblems metOperation

Check, in order:

  • third brake light fuse;
  • connections between DASHBOARD control unit and brake pedal switch;
  • connections between DASHBOARD control unit and bulb;
  • bulb earth See   E2021  BRAKE LIGHTS
Continue to Step 4Defective componentReplace the component involved (if a fuse is involved, search for the cause of the problem)
Connections brokenRestore the connections: See   E2021  BRAKE LIGHTS
Faulty earthRestore the earth contact See   E2021  BRAKE LIGHTS
4CHECKING FACIA CONTROL UNITAll OKProblems metOperation
Check the continuity of the facia control unit internal circuit See   E2021  BRAKE LIGHTS Continue to Step 5Facia control unit circuit brokenChange the facia junction unit
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis